SeaTac, WA Profile: Facts, Map & Data


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SeaTac, Washington - Basic Facts

The City of SeaTac had a population of 28,896 as of July 1, 2016. SeaTac ranks in the upper quartile for Population Density and Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in Washington. See peer rankings below.

The primary coordinate point for SeaTac is located at latitude 47.4434 and longitude -122.2983 in King County. The formal boundaries for the City of SeaTac (see map below) encompass a land area of 10.03 sq. miles and a water area of 0.17 sq. miles. King County is in the Pacific time zone (GMT -8). The elevation is 269 feet.

The City of SeaTac (GNIS ID: 2411855) has a C1 Census Class Code which indicates an active incorporated place that does not serve as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.

Washington is one of 20 states where Census County Divisions (CCDs) are used for statistical tracking of subdivisions within each county. The City of SeaTac is located within Seattle Division of King County.

Beneath the boundary map are tables with SeaTac population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2016.

Neighborhood Data

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City of SeaTac, WA Boundary Map

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SeaTac, WA Data & Demographics (As of July 1, 2016)


Total Population 28,896
Population in Households 28,066
Population in Familes 21,711
Population in Group Qrtrs 830
Population Density1 2,881
Diversity Index2 84


Total Households 10,080
Average Household Size 2.78
Family Households 6,313
Average Family Size 3


Total Housing Units 10,932 (100%)
Owner Occupied HU 5,223 (47.8%)
Renter Occupied HU 4,857 (44.4%)
Vacant Housing Units 852 ( 7.8%)
Median Home Value $269,638
Average Home Value $305,106


Median Household Income $48,247
Average Household Income $60,786
Per Capita Income $21,906
  (Compound Annual Growth Rates)


2010-2015 2015-2020
Population 1.15% 1.34%
Households 0.9% 1.21%
Families 1.05% 1.26%
Median Household Income   1.54%
Per Capita Income   1.66%
1) Population Density = Total Population per square mile.
2) The Diversity Index is a scale of 0 to 100 that represents the likelyhood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.
Based on Census 2010 counts, the Diversity Index for the United States was 60.6 and it is expected to increase to 64.8 by July 1, 2018.

SeaTac, WA - Peer Comparisons by Rank and Percentile

The table below compares SeaTac to the other 627 incorporated cities, towns and CDPs in Washington by rank and percentile using July 1, 2016 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 43 93rd
Population Density1 # 93 85th
Diversity Index2 # 12 98th
Median Household Income # 402 36th
Per Capita Income # 496 21st

Additional comparisons and rankings can be made with a VERY EASY TO USE Washington Census Data Comparison Tool.